Plug cock



March 15 1927* T, H. ADDJE PLUG COCK Filed June 23, 1925 Syvum/woz Patented Mar. l5, 1927.

UNITED sTTEs PATENT oFFicE.

PLUG COCK.

Application led June 23, 1925.

This invention relates to plug cocks and in particular to plug cocks that are adapted for use as acid control valves. Another object of my invention includes the provision of a rugged and serviceable valve construction that will be reliable, and wherein pai'- ticular provision is made for positively seating and unseating the plug. A further ohject embraces the provision of lubricating l0 means whereby the plug seat is kept properl lubricated.

ther objects will appear hereinafter. and l attain these results by the construction illustrated in the accompanying drawing, in

which- Fig. 1 is a longitudinal section ot my plug cock taken on the line 1-1 of Fig. 2, showing the plug in open position.

Fig. 2 is a cross section taken on the line 2--2 of Fig. 1 of my improved plug cock with the handle removed.

Fig. 3 is an enlarged view of head or handle end with the handleand stem carrying the valve lug `turned 90 from the position shown in Fig. 1; that is the plug is in closed position; and

Fig. 4 is a view taken on theline 4-4 ot Fig. 1, and looking in the direction of the arrow.

Like numerals refer to similar parts throughout the several views.

It is among the prime purposes of my invention to provide a plug valve that is practically acid 'prooi and wherein l have provided special means tor slightly lifting the plug to unseat it for more easily moving the same. To this end. l provide a valve plug 10 having a stem 11. which plays in a bushing 12 ot the yoke 13. The plug 10 is preferably tapered to he seated in the valve plug seat 14 of the valve coupling 15. This coupling is provided with a flange 16 at either end having bolt holes 17 for securing the said valve in a suitable conduit (not shown)`. A bore or passage 18 provides for the passagef liquids which are controlled by said valve. The bearing yoke 13'is supported by the yoke seat 24 on the valve seat 20 and is fastened thereto by belts 21. A depending guide 22 limits the movement of the plug and its stern., and a lower stein bearing 23 is supported from the yoke lseat 24 hy suitable bolts 25. These bolts are screw-threaded in the scat and are provided Serial No. 38,997.

with adjusting nuts 26. This construction provides for easy assembling and affords a very firm and substantial support for the valve plug.

lt will be noted that stein 11 is provided with a shoulder 27 and a slightly inclined bearing surface 28 which bearing surface engages a corresponding bearing surface 29 and shoulder 30 on the lower surface of the upper stem bearing or bushing 12. This stem bushing is held in the yoke 13 by appropriate adiusting nuts 31 and. 32 for adjustably positioning the bushing 12 at the proper distance from the plug seat 14, as will presently appear more clearly. The upper edge of the bushing 12 has a slightly inclined bearing seat 33 which terminates in a shoulder 34 and this seat engages the bearing seat 35 and shoulder 36 of the stem handle 37. The stem handle fits on the square head 38 of the stem 11 and is secured in place by a nut 39, or the like. A central conduit 40 having branches 41 and 42 pro-Y vides means for lubricating the plug at its seat. A catch basin 43 beneath the plug provides for any waste and a drain plug 44 is provided for cleaning when needed.

From the disclosure thus far given the operation of my construction will be readily understood. By turning the handle and plug from the wide open position shown, for example in Fig. 1, through 90 so that the'liandle will point straight forward, the i plug will be forced downward by the lower cam surfaces. The limit of the closing movement is determined by the stop surface 34 on the bushing 12 engaging the shoulder 36 on the stem handle. This position is best shown in Fig. 3. By turning the lever and plug back to theposition shown in Fig. 1. the plug will be raised slightly by the upper cam surfaces. The stop shoulder 30 on the bushing 12 limits the movement of the handle and plug lin the open direction. The stop shoulders hold the plug in the exact open or closed .position land the cam surfaces aid in seating the plug in the closed position and in unseating said plug as it is moved from the closed osition. This provision assists in moving t e yplug readily and it also'provides positive means for disengaging theplug from its seat to which it at times adheres.

lt will be also noted that the position of the plug may be adjusted vertically by the adjustment nuts 3l and 32 on the bushing 12 thus properly seating the plug. Lubricant may be supplied to the plug surface and seat by the central conduit 40 and its branches 41 and 42.

While I have described uy specific construction to illustrate my invention, I do not thereby desire to be understood as having limited myself unduly as various modications falling wholly Within the spirit and scope of my invention will present themselves to those versed in the art.

at I claim therefore as new and useful, of my own invention and desire to sel5 cure b Letters Patent is:

A p ug valve comprising a valve coupling having a bushing from the plug seat, a plug fitting in said seat, a, stem on said plug,

a yoke having a for engagingthe stem at a distance 20 plug, means for adjusting said THOMAS HERIOT ADDIE.- 

